# Do we include mass of all earthly objects in determining equations considering mass of earth?

Relevance

Yes. Keep in mind that the mass of individual things is very small compared to the total mass of the Earth.

Total mass of Earth = (approx.)

5,974,200,000,000,000,000,

000,000 kg

Total mass of all living humans = (approx.)

30,000,000,000 kg

Ratio = 0.0000000000001% (give or take a few zeroes).

The speed of a small satellite in orbit at a known distance from Earth depends only on the total mass of the Earth. Therefore, it is much easier to calculate the total mass of the Earth (including everything in and on it) rather than try to separate things.

The Moon's orbit depends on the total mass of the Earth, including the mass of satellites on low orbits around the Earth. So, removing a few hundred kg from Earth's surface and putting them in orbit around us does not change anything.

If we send a probe to other planets, then that mass is lost. However, the Earth gains mass from space dust (and meteoroids) falling in; it also loses mass, far more slowly, with molecules of light gasses being heated to escape velocity in the upper atmosphere.

• Login to reply the answers
• Yeah outside of the space dust that piles up every year, everything on earth, including all animals, and man-made things, were originally from the earth. Humans arent adding any extra weight to the earth that wasnt there before we got here.

• Login to reply the answers
• The mass of the Earth is calculated from its gravitational attraction, so yes, everything on the planet is automatically included.

• Login to reply the answers
• Of course, the earth weighs 5.9742×1024 kg. (this includes everything on the earth) Not including the moon and satellites.

• Login to reply the answers
• Login to reply the answers
• Login to reply the answers
• Login to reply the answers